<!DOCTYPE html>
<html>

<head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> </head>

<body>
    <div class="container">
        <a class="btn btn-primary" href="#" role="button">Link</a>
        <button class="btn btn-primary" type="submit">Button</button>
        <input class="btn btn-primary" type="button" value="Input">
        <input class="btn btn-primary" type="submit" value="Submit">
        <input class="btn btn-primary" type="reset" value="Reset"> </div>
</body>

</html>